Re: [Xen-devel] [PATCH] Prevent xend from starting duplicate domains

[Anthony Liguori <aliguori@xxxxxxxxxx>]

Dan Smith wrote:

> DH> Surely there's a race condition here? The hypervisor op that
> DH> creates a domain has to fail if it would result in two domains
> DH> with the same name; 
>
> With the same domid?  Yes.  Unless I'm completely missing something,
> the hypervisor knows nothing of the *names* of the domains.
>  
The hypervisor has no concept of domain names.  That's entirely a Xend 
construct.  The same applies to UUIDs.
Even if there are two domains with the same name, they have different 
domain IDs which is okay from the hypervisor's perspective.
> Am I wrong?
>
> DH> this can't be reliably enforced by a separate check in the Python
> DH> tools.
>
> Going on the assumption that the names are known only to the tools, I
> think the tools are the best place to perform the check.
>
>  
Regards,

Anthony Liguori

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